Vintage DD turntables. Are we living dangerously?


I have just acquired a 32 year old JVC/Victor TT-101 DD turntable after having its lesser brother, the TT-81 for the last year.
TT-101
This is one of the great DD designs made at a time when the giant Japanese electronics companies like Technics, Denon, JVC/Victor and Pioneer could pour millions of dollars into 'flagship' models to 'enhance' their lower range models which often sold in the millions.
Because of their complexity however.......if they malfunction.....parts are 'unobtanium'....and they often cannot be repaired.
128x128halcro
Regensburg in Bavaria may be closer to you chakster......
That's where Thuchan's Tech resides and I've witnessed his work first-hand.
It's first class and he now knows the TT-101 inside out....
Hi Misha,

The two seconds for the display to change is normal.  If you put it in run mode you can watch it count up.  It does the same in hold mode, though only updates the display at the end of the cycle - every 1.8s IIRC.  

If it's stopping as Lew described you've a situation where too much current is being supplied to the motor.  Time won't fix this; it's likely there's a bad connection on the board.  
Chak, Your symptom sounds a bit different from mine, although maybe close enough to have the same cause.  As I wrote somewhere here, my TT101 would start up fine and go to correct speed, but it would very soon thereafter start to "hunt"; the tach would show 33.32, then 33.34, etc. Very shortly after that, the tach would go dark except for the decimal point, and the platter would coast to a halt.  This whole process from start to stall never took more than 2 minutes, tops.

Like JP says, in "HOLD" mode, the tach stays blank until it sees the set speed; then it displays.  Thus it is not abnormal to have a short time delay before the tach lights up, but at that moment, it should show the correct set speed.  In RUN mode, it counts up from zero to set speed, visually from the moment you press the button, so there is no delay in that mode.

Don't give up.  We are not living dangerously, just frustratingly.
SO WHAT CAN I DO? Is that require some sort fo special knowlegde or experience to fix it locally with some tech?
IMO, you probably don't require a man of knowledge. What you require is someone with soldering skills and keen eyes (aided by a magnifying glass). I haven't been following this thread very closely lately, but I believe a goodly percentage of tt 101's documented on this thread have been resurrected solely by resoldering all the joints. 

You need to find someone who will undertake that task. And make clear to him that even if a joint appears to be fine that he should re-do it anyways. My hero, Dave Brown, called it the brute force method
@lewm
Chak, Your symptom sounds a bit different from mine, although maybe close enough to have the same cause. As I wrote somewhere here, my TT101 would start up fine and go to correct speed, but it would very soon thereafter start to "hunt"; the tach would show 33.32, then 33.34, etc. Very shortly after that, the tach would go dark except for the decimal point, and the platter would coast to a halt.

Indeed, Lew. My drive "hunt" for a few seconds in the start only with "HOLD" mode (when it can be displayed 33.32 or so just for second), but then display correct 33.33 or 45.00 continuously up to 1 hour with no changes, then just "go dark except for the decimal point". So just a little difference from yours.


@jpjones3318

If it’s stopping as Lew described you’ve a situation where too much current is being supplied to the motor. Time won’t fix this; it’s likely there’s a bad connection on the board.

Thanks for letting me know, hmm

@banquo363
What you require is someone with soldering skills and keen eyes (aided by a magnifying glass). I haven’t been following this thread very closely lately, but I believe a goodly percentage of tt 101’s documented on this thread have been resurrected solely by resoldering all the joints.

Good to know, i hope so! I will look for the proper technician locally at first.